单项选择题
A change of trim may be simply defined as（）.
A.the change in difference between the forward and aft drafts B.the sum of free communication, free surface and pocketing C.the moment of inertia of the ship's waterline plane about the athwartship axis D.rolling and listing
单项选择题 A cofferdam is（）.
单项选择题 A combustible gas indicator meter is calibrated to read the percentage of（）.
单项选择题 A container with high cube would most likely be used to stow（）.
